Add readme and codeowners

CODEOWNERS

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+* @puppetlabs/night-s-watch

README.md

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+# install-puppet
+
+One-shot shell script that can be used to install puppet-agent on a supported
+POSIX platform.
+
+## Description
+
+This repository contains a Ruby script (`install.rb`), which when executed will
+generate an `install.sh` file to be used for installing puppet-agent on
+supported FOSS POSIX platforms.
+
+The script leverages Bolt tasks from the
+[puppet_agent](https://forge.puppet.com/modules/puppetlabs/puppet_agent) and
+[facts](https://forge.puppet.com/modules/puppetlabs/facts) modules, and
+attempts to change as few things as possible in order to create a working shell
+script which can be used with little to no external dependencies
+
+## Getting Started
+
+### Dependencies
+
+* A non-Windows platform for which Puppet provides official packages (see the full list [here](https://puppet.com/docs/puppet/latest/system_requirements.html#supported_operating_systems-packaged-platforms))
+* one of wget/curl/fetch/perl-LWP-Simple in order to download packages
+
+### Usage
+
+```sh
+curl -sSL https://raw.githubusercontent.com/puppetlabs/install-puppet/main/install.sh | bash
+```
+
+Piping to `bash` is a controversial practice, so you are encouraged to inspect
+the [contents of the
+script](https://github.com/puppetlabs/install-puppet/blob/main/install.sh)
+before executing it.
+
+
+### Script arguments
+
+If run with no arguments, the script will install the latest stable version of puppet-agent. 
+
+You can install a specific version using:
+```sh
+curl -sSL https://raw.githubusercontent.com/puppetlabs/install-puppet/main/install.sh | bash -s -- -v 6.24.0
+```
+
+Below is the full list of configurable options:
+
+* `-v`/`--version` - install a specific puppet-agent version
+* `-c`/`--collection` - install a specific puppet-agent collection (e.g. puppet7)
+* `-n`/`--noop` - do a dry run, do not change any files
+* `--cleanup` - remove the puppetlabs repository after installation finishes
+
+## Development
+
+The Ruby script uses parts of the `bash.sh` task from the
+[facts](https://forge.puppet.com/modules/puppetlabs/facts) module, and the
+`install_shell.sh` task from the
+[puppet_agent](https://forge.puppet.com/modules/puppetlabs/puppet_agent) module
+to generate the `install.sh` file. The modules are vendored as git submodules;
+in order to initialize them, run `git submodule update --init` after cloning
+this repository.
+
+After making your changes, run the following command to regenerate the shell script:
+```sh
+ruby install.rb
+```
+
+You can also run shellcheck on the resulting script, it will skip the vendored
+task parts and only warn on code specific to this repository.
+
+```sh
+shellcheck install.sh
+```
+
+## License
+
+This project is licensed under the Apache 2.0 License - see the LICENSE file for details

install.rb

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   fi
 fi
 SH
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